18786 has 16 divisors (see below), whose sum is σ = 39168. Its totient is φ = 6000.

The previous prime is 18773. The next prime is 18787. The reversal of 18786 is 68781.

It is a Curzon number.

It is a plaindrome in base 14.

It is a nialpdrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (18787) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 136 + ... + 236.

It is an arithmetic number, because the mean of its divisors is an integer number (2448).

2¹⁸⁷⁸⁶ is an apocalyptic number.

18786 is an abundant number, since it is smaller than the sum of its proper divisors (20382).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19584).

18786 is a wasteful number, since it uses less digits than its factorization.

18786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137.

The product of its digits is 2688, while the sum is 30.

The square root of 18786 is about 137.0620297530. The cubic root of 18786 is about 26.5834558966.

The spelling of 18786 in words is "eighteen thousand, seven hundred eighty-six".